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650-A: Difference between revisions
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|caption=General Radio 650-A Impedance Bridge | |caption=General Radio 650-A Impedance Bridge | ||
|series=650 | |series=650 | ||
|introduced= | |introduced=1934 | ||
|discontinued=1956 | |discontinued=1956 | ||
|designers= | |designers= | ||
| Line 15: | Line 15: | ||
{{Catalog History}} | {{Catalog History}} | ||
}} | }} | ||
The {{Title|General Radio 650-A Impedance Bridge}} was introduced in {{Catalog | The {{Title|General Radio 650-A Impedance Bridge}} was introduced in {{Catalog G2}} and remained available through {{Catalog O}}. | ||
The Type 650-A is a CRL impedance bridge with a basic measurement accuracy between 1% and 2%. Its a self contained battery operated null instrument with an internal AC generator and DC potential. The internal AC generator is the microphone hummer Type [[572-B]] powered by four six inch dry cell batteries. The DC test potential is derived from same series of batteries located in a compartment at the back of the copper lined walnut case. Inductance and capacitance is measured in six ranges and resistance in seven ranges. Measurements are made using three bridge circuits, the Wheatstone, Hay and Maxwell. The recommended detector is a pair of high-impedance headphones for AC measurements. A panel galvanometer with a switchable shunt is used for DC nulls. | The Type 650-A is a CRL impedance bridge with a basic measurement accuracy between 1% and 2%. Its a self contained battery operated null instrument with an internal AC generator and DC potential. The internal AC generator is the microphone hummer Type [[572-B]] powered by four six inch dry cell batteries. The DC test potential is derived from same series of batteries located in a compartment at the back of the copper lined walnut case. Inductance and capacitance is measured in six ranges and resistance in seven ranges. Measurements are made using three bridge circuits, the Wheatstone, Hay and Maxwell. The recommended detector is a pair of high-impedance headphones for AC measurements. A panel galvanometer with a switchable shunt is used for DC nulls. | ||